The 50-400mm F4.5-6.3 utilises the renowned VXD linear motor focus mechanism. This advanced AF mechanism combines class-leading speed and precision, enabling fast and accurate focusing from MOD (Minimum Object Distance) through to infinity. The lens is equipped with TAMRON's proprietary VC2 mechanism and effectively controls camera shake that can occur when shooting at telephoto focal lengths. It also helps reduce fuzzy pictures when shooting handheld in low-light conditions which would usually require slower shutter speeds.

The 50-400mm F4.5-6.3 is capable of extremely high performance when shooting close-ups, particularly for an ultra-telephoto zoom lens. Users can enjoy half-macro shooting with an MOD of 0.25m (9.8 in) and a maximum magnification ratio of 1:2 at the 50mm zoom setting. Moreover, at the 400mm telephoto end, the MOD is 1.5m (59.1 in), thereby providing a maximum magnification ratio of 1:4 for amazing, dynamic shots. The unprecedented level of freedom in shooting reveals the charm of subjects more than ever, plus flexible shooting options previously unseen in ultra-telephoto zooms.

The generous and effective use of special lens elements, including XLD (eXtra Low Dispersion), LD (Low Dispersion) and Hybrid Aspherical lens elements, effectively delivers uncompromising high image quality throughout the entire 50-400mm zoom range.

Along with its superb performance, the lens is just 183.4mm (7.2 in) long and weighs only 1,155g (40.7 oz). Offering about the same light weight and compact size as a conventional 100-400mm zoom, it’s easy to pack and comfortable to carry all day.